isDOMComponent(instance)

it('demonstrates the ReactComponent tree', function() {
  var React = require('react/addons');
  var TestUtils = React.addons.TestUtils;
  var MyComponent = require('../MyComponent.jsx');

  var renderedTree = TestUtils.renderIntoDocument(<MyComponent />);
  var renderedMyComponent = TestUtils.findRenderedDOMComponentWithClass(renderedTree, 'my-component')

  expect(TestUtils.isDOMComponent(renderedMyComponent)).toBe(true);
});

isDOMComponent(instance)

scryRenderedDOMComponentsWithClass(
  tree,
  className
)

import React from 'react';
import ReactDOM from 'react-dom';
import { act } from 'react-dom/test-utils';import Counter from './Counter';

let container;

beforeEach(() => {
  container = document.createElement('div');
  document.body.appendChild(container);
});

afterEach(() => {
  document.body.removeChild(container);
  container = null;
});

it('can render and update a counter', () => {
  // Test first render and componentDidMount
  act(() => {    ReactDOM.render(<Counter />, container);  });  const button = container.querySelector('button');
  const label = container.querySelector('p');
  expect(label.textContent).toBe('You clicked 0 times');
  expect(document.title).toBe('You clicked 0 times');

  // Test second render and componentDidUpdate
  act(() => {    button.dispatchEvent(new MouseEvent('click', {bubbles: true}));  });  expect(label.textContent).toBe('You clicked 1 times');
  expect(document.title).toBe('You clicked 1 times');
});

findAllInRenderedTree(
  tree,
  test
)

isElementOfType(
  element,
  componentClass
)

const domContainer = document.createElement('div');
ReactDOM.render(element, domContainer);

class Counter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {count: 0};
    this.handleClick = this.handleClick.bind(this);
  }
  componentDidMount() {
    document.title = `You clicked ${this.state.count} times`;
  }
  componentDidUpdate() {
    document.title = `You clicked ${this.state.count} times`;
  }
  handleClick() {
    this.setState(state => ({
      count: state.count + 1,
    }));
  }
  render() {
    return (
      <div>
        <p>You clicked {this.state.count} times</p>
        <button onClick={this.handleClick}>
          Click me
        </button>
      </div>
    );
  }
}

mockComponent(
  componentClass,
  [mockTagName]
)

isElement(element)